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From "zhaoyunjiong (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5541) Improved algorithm for whether need speculative task
Date Thu, 24 Oct 2013 01:46:44 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5541?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13803654#comment-13803654
] 

zhaoyunjiong commented on MAPREDUCE-5541:
-----------------------------------------

On branch-1.2, ant test have below Failures and Errors with this patch, none of them related
to this patch:
    [junit] Running org.apache.hadoop.cli.TestCLI
    [junit] Tests run: 1, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 57.154 sec
    [junit] Running org.apache.hadoop.fs.TestFileUtil
    [junit] Tests run: 8, Failures: 2, Errors: 0, Skipped: 0, Time elapsed: 3.683 sec
    [junit] Running org.apache.hadoop.fs.TestLocalDirAllocator
    [junit] Tests run: 5, Failures: 3, Errors: 0, Skipped: 0, Time elapsed: 0.099 sec
    [junit] Running org.apache.hadoop.hdfs.server.namenode.TestStartup
    [junit] Tests run: 4, Failures: 3, Errors: 0, Skipped: 0, Time elapsed: 205.051 sec
    [junit] Running org.apache.hadoop.fs.TestFsShellReturnCode
    [junit] Tests run: 4, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 0.752 sec
    [junit] Running org.apache.hadoop.filecache.TestTrackerDistributedCacheManager
    [junit] Tests run: 11, Failures: 11, Errors: 0, Skipped: 0, Time elapsed: 1.089 sec
    [junit] Running org.apache.hadoop.hdfs.server.namenode.TestNameNodeMXBean
    [junit] Tests run: 1, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 3.004 sec
    [junit] Running org.apache.hadoop.hdfs.server.datanode.TestDiskError
    [junit] Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0 sec
    [junit] Running org.apache.hadoop.hdfs.server.namenode.TestCheckpoint
    [junit] Tests run: 3, Failures: 0, Errors: 2, Skipped: 0, Time elapsed: 77.738 sec
    [junit] Running org.apache.hadoop.ipc.TestRPC
    [junit] Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0 sec
    [junit] Running org.apache.hadoop.hdfs.server.namenode.TestNameEditsConfigs
    [junit] Tests run: 2, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 79.839 sec
    [junit] Running org.apache.hadoop.hdfs.TestSyncingWriterInterrupted
    [junit] Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 90.102 sec
    [junit] Running org.apache.hadoop.hdfs.server.namenode.TestStorageDirectoryFailure
    [junit] Tests run: 3, Failures: 0, Errors: 2, Skipped: 0, Time elapsed: 141.996 sec
    [junit] Running org.apache.hadoop.hdfs.server.namenode.TestStorageRestore
    [junit] Tests run: 2, Failures: 0, Errors: 2, Skipped: 0, Time elapsed: 134.115 sec


> Improved algorithm for whether need speculative task
> ----------------------------------------------------
>
>                 Key: MAPREDUCE-5541
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5541
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: mrv1
>    Affects Versions: 1.2.1
>            Reporter: zhaoyunjiong
>            Assignee: zhaoyunjiong
>             Fix For: 1.2.2
>
>         Attachments: MAPREDUCE-5541-branch-1.2.patch, MAPREDUCE-5541-branch-1.2.patch
>
>
> Most of time, tasks won't start running at same time.
> In this case hasSpeculativeTask in TaskInProgress not working very well.
> Some times, some tasks just start running, and scheduler already decide it need speculative
task to run.
> And this waste a lot of resource.



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